[AngularJS] Angular 6 datatable serverside ajax request not working

[bitdirector]

I am using angular datatable(1.10.19). 

ref this:

http://l-lin.github.io/angular-datatables/#/basic/server-side-angular-way

 
I have written web api in c# to get the data in desired format.
With following dtoptions, server side is working fine.
 
    dtOptions = {
                        pagingType: 'full_numbers',
                        pageLength: 10,
                        processing: true,
                        serverSide: true,
                        orderCellsTop: true,
                        ajax: (dataTablesParameters: any, callback) => {
                           
                            this.mainpageservice.GetPaginatedData(this.
menuID, this.UserName, dataTablesParameters)
                                .subscribe(resp => {
                                    this.Module = resp.data;
                                    console.log('serverside', this.Module);
                                    callback({
                                        recordsTotal: resp.recordsTotal,
                                        recordsFiltered: resp.
recordsFiltered,
                                        data: [],
                                    });
                                });
                        },



Now, I want to display multiple tables that too using serverside angular 
way datatable. so to achieve this, 

I am using: 
http://l-lin.github.io/angular-datatables/#/advanced/multiple-tables

as documented, I have created one function which is returning Datatable 
settings. But here ajax call is not working. 

Can anyone suggest where I am doing wrong?. 


        private buildDtOptions(menu: number, Username: string): DataTables.
Settings  {
        alert('call');
        return {
            pagingType: 'full_numbers',
            pageLength: 10,
            processing: true,
            serverSide: true,
            orderCellsTop: true,
            ajax: (dataTablesParameters: any, callback) => {
                console.log(dataTablesParameters);
                this.mainpageservice.GetPaginatedData(menu, Username, 
dataTablesParameters).subscribe(resp => {
                        this.Module = resp.data;
                        console.log('serverside', this.Module);
                        callback({
                            recordsTotal: resp.recordsTotal,
                            recordsFiltered: resp.recordsFiltered,
                            data: [],
                        });
                    });
            }
            
        };
    }



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